Before you perform the migration, make a list of any customizations you have made to your existing installations and ensure you have a backup copy of your customized files.
For example, if you have changed configuration settings for the Process Center using the 100Custom.xml file, you need to have a copy of that file available. This enables you to easily apply your customized settings to the new installation.
If you have customized the length of tracked fields in the Performance Data Warehouse database, be sure to update the value of the Performance Data Warehouse's max-length-of-string-columns property. For more information, see Extending the maximum number of characters in tracked performance data.